Pump jack



' Sept. 7 1926.

EQHARDS PUMP JACK Filed Dec. 15. 1924 2 Sheets-Sheet l amm' iii/2mm 1%7655 IRE--E- fi f SPt- 7,1926. u i E5;

, E. HARDS PUMP JACK Filed Dec. 15 1924 2 Sheets-Sheet 2 EE-JL flaw; $11 9 Patentedsept. 7, 1926.

nnwm ms, or nsamuu, cams-om rm. JACK.

Application filed December 15, 1924. semi in. 756,075. 5

1 This invention relates to new and useful improvements in pumpjacks designed primarily for use in connection with the pumps of oil wells, although not restricted to this particular field of use.

It is the principal object of the invention to provide a 'ack of novel construction which will pro uce a long steady stroke on the ump rod, will have no tendency to buck e or break said rod even when gas pockets are encountered, will operate with extreme ease and will be generally more efiicient and desirable than the types of jacks now commonly used, provision eing made in the preferred form of. construction, whereby the weight of the pum rod operating member, connected parts of the pum and the load raised thereby are substantial y counterbalanced, so that very little power is needed to operate the jack and thepump. A further object is to provide a pump jack construction which may be constructed substantially in its entirety, from well known stock steel and machine parts which may be readily purchased on the market, p

ense of manufac-' so that the work and ex ture will be out down to t e minimum.

Yet another object is to rovide a structure in which effective provlsion is made for lubrication.

\Vith the foregoing and minor objects in view, the invention resides in the novel subcured to these beams are two channel-steel ject matter hereinafter described and claimed, the description being supplemented by the accompanying drawings.

Figure 1 is a side elevation of a pump jack constructed in accordance with my invention.

Figure 2 is an enlarged vertical longitudinal sectional view, partly in elevation.

Figure 3 is a vertical transverse sectional view as indicated by line 3-3 of Fig. 2.

Figure 4 is a horizontal section online 4-4: of Fig. 2.

Figure 5 is a side elevation of the reciprowhich is connected to the the catory cross-head pump rod. 7,

Figure 6 is an upper edge view of cross head shown in ig. 5.

The general frame structure of the jack is in the form of a-tower whose sills 1 are p1 preferably formed of I-beams. Suitably ses'tandards 2 which are disposed in opposed relation and are suitably connectedat their upper ends by a top frame 3. Secured to the have their flanges 6 inner sides of the standards 2, between their inwardly extendin flan es 4, are two short vertical pieces of c anne steel 5 and 5, the flanges ,6 of each metal channel 5-5 bein extended inwardly toward the correspond mg flanges of the other channel. In the construction shown, horizontally elongated metal plates 7 and similar lates 8 under them, are disposed in inward y spaced relation with the body portions of the channels 5 and 5 and are secured to the vertical edges of their flanges 6, in any preferred manner. The plates 7 are preferably somewhat longer than the plates 8 and they project beyond the flanges 6, the projectingh ends of one plate! being connected with t e correspondmg ends of the other plate 7, by horizontal plates 9 having a function to be hereinafter explained. Y

Appropriate bearings 10 are supported horizontally inopenings formed through the body portions of the channels 5, through the ad acent ortions of the standards 2, and through t e plates 8, said bearings being referably of the roller ty e. In these bearlngs, short horizontal sha s 11 are rotatably mounted, said shafts havin sprockets 12 on their inner ends, one spro et being carried by each shaft. At theoutersides of these sprockets, spur gears 13 are shown on the siafts 11, which gears mesh with driving pinions 14 on a horizontal shaft 15 which extends between the upper ends of the standards 2 and is rotatably mounted in be driven by any suitablemeans and I have illustrated a sprocket 22 and chain 23 for this purpose.

Secured to the ards 2, near the lower end of the tower, I have shown steel channels 5 and 5 which correspond to \the channels 5 and 5 and ates 8- and 8", the former being connected with the flan es of the channel 5 and the latter bein o greater height than the channel 5, so t at the lower portion of the plate 8 ma support one of the bearings 21 for inner sides of the stand-" connected by vertical the shaft 20, the other of said bearings be- 24 are trained aroun ing supported by the body portion of the channel 5 and the adjacent portion of the contiguous standard 2. The upper portions of the plate 8 and the channel 5", su port one of a air of bearings 10 for two ower axially a ined shafts 11, the other of said bearings 10 being supported by the channel 5 and the associated plate 8". The shafts 11' are provided with sprockets 12, and two parallel vertically dis osed sprocket chains these sprockets and the driven sprockets 12,. said chains being connected by a transverse horizontal-roller 26 or some equivalent device, and wherever the term roller appears hereinafter, it is to be understood that this expression is intended to cover any member which might be used to connect the chains, in place of an actual roller.

head with the pump rod, I preferably provide the former with vertically alined openings 30 in which the upper end of the rod 7 may be secured by any preferred means.

These openings areas near as ossible to a vertical plane passing throug' the upwardly moving reaches of the sprocket chains 24, so that the upward pull on the crosshead 28,by means of the roller 26, will be exerted as nearas possible to the rod,

overcoming any liability of excessively canting the cross-head. To guide this crosshead, I provide .a pair of vertical channel steel tracks 31 whose upper ends are suitably secured to the platess9, said cross-head preferably having '-anti-friction rollers 32 which enga e said tracks. The lower ends of the trac s 31 may well 1 be secured to opposite side walls 33 of a lubricant containing receptacle 34 which is provided in the lower portion of the tower. This receptacle is positioned so that the shaft 20, sprocket 19, and chain 18, run in the lubricating oil contained in saidrece tacle,

. .and if desired, an appropriate open ng 35 may be provided in one of the side walls 33 to serve as a guide for filling the receptacle to the proper level.

A vertical tube 36 is secured in a fluidtight manner 'to the bottom 37 of the receptacle 34, and said bottom is formed with an opening 38 at the lower end of said tube. This 0 ening and tube receive the pump rod 29 an the tube extends to a point above the oil level of the receptacle 34 so that no wastage of oil may take place through said tu e. a

Mounted upon an appropriate bracket 39' upward stroke.

havin its ends de ending therefrom, is a flexib e element $110 as a chain 41, one end of this chain being connected at 42 to the cross head 28, .wlnle its other end is provided with a weight 43 which may well be formed of sections carried by a rod 44, so that any desired number of such sections 'may be applied; The weight 43, acting on er is necessary for its operation. Moreover,

the effective lubrication provided for a numher of the moving parts, by the oil rece tacle 34, also plays an important part 1n producing a pump jack which will operate with as little friction as possible. Obviously, for lubricating parts which are not oiled from the contents of the receptacle 34, any desired provision may be made.

Unusually advantageous results have been obtained from a jack constructed in accordance with the present invention and'on account of s'uch advantages, the general construction herein disclosed, is preferabl followed. However, within the scope of t e invention as claimed, numerous modifications may be made.

I olaim:

1.' Av pump jack comprising a pair of opposed interconnected standards, upper and lower pairs of stub shafts between said standards, each pair being transversely alined and having their inner ends ,spaced a art, sprockets on said inner ends, a pair of c ains trained over the sprockets, a cross head reciprocable between and carried by said chains and adapted for connection to a depending pump rod a shaft arranged ad- ]acent and in parallel relation to the upper tially enclosing the last named stub shaft and sprocket.

2. A pump 'ack comprisin avpair of opposed standar s each having aterally spaced vertical flan es, the flanges of one standard projecting inwardly toward those of the other standard, upper and lower plates (sipaced inwardly from said standards and isposed in vertical planes, said plates being secured to said flanges and the plates adjacent one standard being opposed to those of a ll A s rockets, a roller connected at its ends to t e two sprocket chains, a cross head between said chains having a horizontal guideway receiving said roller, a air of stationary vertical tracks for gui 'ng said cross head, and means for driving at least one sprocket of each chain.

3. A pump 'ack comprisin a pair of opposed standar s each having aterally spaced vertical flanges, the flanges of one standard projecting inwardly toward those of" the other -standard, upper and lower plates 's aced inwardly from said standards and i'sposed in vertical planes, said plates being secured to said flanges and the plates adjacent one standard being opposed to those of :the other standard, upper and lowerhorizontal shafts rotatably supported by said plates and the opposed portions of the standards, said shafts having an upper pair ofv alined spaced sprocket-s and a lower pair of axially alined spaced sprockets, a pair.

of s rocket chains trained around said s roe ets, a roller connected at its ends to t e two sprocket chains, a cross head between said chains having a horizontal guideway receiving said roller, means cooperable with portions of said standards in forming an oi for guiding the a ove-named cross head, the

lower ends of said'tracks'being secured toreceptacle a pair of vertical tracks.

opposed sides of said oil receptacle, means stationarily mounting the upper ends of said tracks, and means for driving at least one of the sprockets of each of the sprocket chains. -.k f

4. A pump 'ac comprising a pair'o opposed standar a each having laterally spaced vertical flanges, the flanges of one standard projecting inwardly toward those of the other standard, upper and lower plates spaced inwardly from said standardsand disposed in vertical planes, said plates being secured to saidflanges and the lates adjacent one standard being oppose to those of the other standard, upper and lower horizontal shafts rotatably supported by said plates and the opposed portions of the standards, said shafts having an u per. pair of alined spaced sprockets and a ower pair of axially alined spaced sprockets, a pair of sprocket chains trained around said sprockets, a-roller connected at its ends to the two sprocket chains, a cross. head between said c ains having a horizontal guideway receivin 1 said roller, a pair of vertical tracks for guiding the above named cross head, plates EDWARD HARDS. 

